Track



tudinal partition having slots extending downwardly from its upper edge to embrace said transverse partitions, so that said longitudinal partition may be moved downwardly with respect to said transverse partitions to collapse the carton.

5. A collapsible carton comprising one piece of sheet material cut and folded to provide front and back walls and a bottom, said bottom being sloped upwardly from the front and back edges of the carton toward the center thereof and having a downwardly extending fold doubled back upon itself and running substantially along the longitudinal center line of said bottom, said fold extending downwardly substantially to the horizontal plane of the front and back edges of said carton to assist in supporting said carton, and a second piece of sheet material having its bottom edge inserted and secured within said fold and extending thence upwardly to form a longitudinal partition and a strengthening and stiffening rib for said carton, said bottom and said second piece of sheet material being movable downwardly from their normal erected positions for collapsing the carton.

6. A carton comprising one piece of sheet material cut and folded to provide front and back walls, a bottom, transverse partitions, and a cover, said bottom being sloped obliquely upwardly from the front and back edges of the carton toward the center thereof and having a downwardly extending fold doubled back upon itself and running substantially along the longitudinal center line of said bottom, the lower edge of said fold lying substantially in the horizontal plane of the front and back edges of said carton, and a second piece of sheet material having its bottom edge inserted in said fold and extending longitudinally along said carton to form a longitudinal partition therein, said second piece of sheet material also interlocking with said transverse partitions and extending upwardly to a position contacting with said cover when closed, to form a support for said cover.

'1. A carton comprising sheet material cut and folded to provide front and back walls, a bottom, transverse partitions, and a longitudinal partition, said bottom being secured to the lower edges of said front and back walls and extending thence obliquely upwardly and toward the center of said carton and thence substantially vertically downwardly substantially to the plane of said lower edges to provide additional support for said bottom, said longitudinal partition being between and secured to said vertically extending portions of said bottom and extending thence upwardly and being interlocked with said transverse partitions to hold them in place.

8. A collapsible and erectable carton comprising sheet material cut and folded to provide front and back walls, a bottom, transverse partitions, and a longitudinal partition, said bottom being secured to the lower edges of said front and back walls and extending, when the carton is erected, obliquely upwardly and toward the center of said carton and thence substantially vertically downwardly substantially to the plane of said lower edges to provide additional support for said bottom, said longitudinal partition being held between and secured to said vertically extending portions of said bottom and extending thence upwardly and being interlocked with said transverse partitions to hold them in place, said longitudinal partition having slots extending downwardly from its upper edge substantially in the planes of said transverse partitions so that it may be disengaged from said transverse partitions and moved downwardly to permit said transverse partitions to be shifted and the carton to be collapsed.

9. A collapsible and erectable carton comprising one piece of sheet material cut and folded to provide front and back walls, a bottom, and transverse partitions, said bottom extending, when the carton is erected, obliquely upwardly from its front and back edges toward its center and having a downwardly extending fold doubled back upon itself and running substantially along the longitudinal center line of said bottom, and a second piece of sheet material having its lower edge inserted within said fold and extending thence upwardly to form a longitudinal partition interlocking with said transverse partitions, said longitudinal partition having slots extending downwardly from its upper edge substantially in the planes of said transverse partitions so that it may be disengaged from said transverse partitions and moved downwardly to permit said carton to be collapsed.

CHARLES B. KLEFEKER.

Oct. 2, 1934. KNOX ET-AL 1,975,107

' TRACK Filed July 16, 1931 2 Sheets-Sheet l IN VEN TORS Harry A Kn 5x 00L 2, 1934 A, KNQX )ET AL 1,975,167

TRACK Filed July 16, 1931 2 Sheets-Sheet 2 INVENTORS Harry A Knnx BY Bart F-Baker TTORNEY Patented Oct. 2, 1934 UNITED STATES PATENT OFFICE TRACK Harry A. Knox and Bert F. Baker, Davenport,

' Iowa.

(Granted underthe act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to us of any royalty, thereon.

This invention relates to a track for tracklaying vehicles.

When track-laying vehicles are driven at high speeds the wear on the link pins and the bearings is so excessive that these members must be replaced after about 15 0 miles of running.

The purpose of the present invention is to increase the mileage life of the track and to this end the link pins are divided into a fixed part and a rocker part. Novel means are provided to secure the parts in place and the arrangement is such that a lubricant may readily be supplied in order to lubricate the bearing surfaces as well as seal the joints.

With the foregoing and other objects in view, the invention resides in the novel arrangement and combination of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

A practical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is an inner planview of a portion of the lower flight of a track constructed in accordance with the invention. ,7

. Fig. 2 is a view in side elevation of Fig. 1. Fig. 3 is a view in end elevation of Fig. 1. v Fig. 4 is a detail plan view of the link pin. Fig. 5 is a view in right end elevation of Fig. 4. Fig. 6 is a view in left end elevation of Fig. 4. Fig. '7 is a detail left view of the rocker. Figs. 8 and 9 are sectional views illustrating a modified form of the invention in which the rockers are anchored in place. I

Referring to the drawings by characters ,of reference:

Thev track chain comprises a series of similar link sections A connected by link pins B.

The general design and configuration of the link sections A are more or less conventional and are not pertinent to the present invention. As illustrated each link section consists generally of a transverse shoe or grouser 5 integral with the end bearings 6 of sets of spaced link members 7-'7 and also integral with the webs 7a of the link members. The bearings 8 on the free extremities of the link members are internally offset with respect to the bearings 6 so that as clearly seen in Fig. 1 the bearings 8 of one section -A may fit between the bearings 6 of an adjoining section. A link pin 9 passing through the bearings 6 and 8 of adjoining link sections serves to couple said sections. 7

Referring to Fig. 4 the major portion 9 of the pin B is cylindrical but the extremities 10 are semi-cylindrical. The cylindrical portion 9 is formed with a tangential groove 11 positioned, when the pin is assembled in the bearings of the links, to register with a threaded aperture 12 tangential to the bearing 8 of the outermost link member 7. A binder bolt 13 threaded into the aperture 12 is disposedin the groove 11 of the 7 pin. The bearing 8 of the outermost link member is provided with a slot 14 cut perpendicular to the axis of the aperture 12 and above the threaded portion thereof so that a clamping action may be obtained when the bolt is screwed down tight. 7 The pin B is thus securely fixed to the bearing and is held against rotational and axial displacement. As shown each bolt 13 is preferably located on the inside of the bearing 8 towards the bearing 6 and perpendicular to the plane of the link member 7.

A longitudinal passage 15 is formed in the cylindrical portion 9 of the pin to establish a fluid communication to'the spaces opposite the semi-cylindrical ends 10 of the pin. The ends of the passage are provided with threads 16 for the reception of an extraction tool which is to be employed in withdrawing the pin from the bearmgs.

When the 'pin is inserted in the bearings to couple adjoining link sections the semi-cylindrical ends 10 are disposed in the bearings 6. A rocker 17 placed in each bearing 6 opposite the ends 10 0f the pin is the form of a minor segment'of the pin having a circular surface 18 fltting the bearing 6 and angularly inclined radial sides 19-19 providing a bearing edge 20 seating centrally on the plane face 10a of the end 10. The angularity of the sides 19 is such that the angle made between each side and the corresponding part of the plane face 10a is preferably equal to the angle of flexure in passing around sprocket and idler wheels of an endless track.

The rocker is formed with a threaded passage 21 adapted to be aligned with the passage 16 of the pin. An arcuate channel 22 in each end face of the rocker establishes fluid communication from one side to the other. 

